{"id":17482,"date":"2026-01-13T14:48:47","date_gmt":"2026-01-13T14:48:47","guid":{"rendered":"https:\/\/www.c2psu.com\/?p=17482"},"modified":"2026-01-13T14:48:50","modified_gmt":"2026-01-13T14:48:50","slug":"doe-level-vii-efficiency-for-external-power-supplies-eps","status":"publish","type":"post","link":"http:\/\/www.c2psu.com\/zh\/doe-level-vii-efficiency-for-external-power-supplies-eps\/","title":{"rendered":"Understanding DoE\u00a0Level VII Efficiency for External Power Supplies (EPS)"},"content":{"rendered":"

Level VII Efficiency for External Power Supplies (EPS)<\/strong>
The Next Frontier in Energy Savings<\/strong><\/p>\n\n\n\n

What is Level VII?<\/strong><\/h3>\n\n\n\n

Level VII is the proposed next tier<\/strong> of mandatory energy-efficiency standards for External Power Supplies (EPS) in the United States, as set forth by the U.S. Department of Energy (DOE)<\/strong>. It is designed to replace the current Level VI<\/strong> standards, which have been in effect since 2016. Level VII aims to drastically reduce energy waste from power adapters, which are used in billions of electronic devices worldwide.<\/p>\n\n\n\n

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Key Objectives<\/strong><\/h3>\n\n\n\n
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  1. Reduce Standby (No-Load) Power Consumption<\/strong>\u00a0\u2013 The primary focus is to cut the power drawn by an EPS when it\u2019s plugged in but not actively powering a device (e.g., a phone charger left in the outlet overnight).<\/li>\n\n\n\n
  2. Improve Active-Mode Efficiency<\/strong>\u00a0\u2013 Ensure more of the AC input power is converted to usable DC output during operation, reducing heat loss.<\/li>\n\n\n\n
  3. Lower National Energy Use & Carbon Emissions<\/strong>\u00a0\u2013 By improving efficiency across millions of power supplies, the standard aims to significantly cut U.S. electricity consumption and greenhouse gas emissions.<\/li>\n\n\n\n
  4. Align with Global Standards<\/strong>\u00a0\u2013 Harmonize U.S. regulations with international norms (e.g., EU CoC Tier 2, China standards) to simplify global manufacturing.<\/li>\n<\/ol>\n\n\n\n
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    Proposed Technical Requirements<\/strong><\/h3>\n\n\n\n

    While still in the rulemaking phase, key expected changes compared to Level VI include:<\/p>\n\n\n\n

    Parameter<\/strong><\/th>Level VI (Current)<\/strong><\/th>Level VII (Proposed)<\/strong><\/th><\/tr><\/thead>
    No-Load Power<\/strong><\/td>0.100\u20130.210 W (depending on output power)<\/td>As low as 0.010 W (10 mW)<\/strong> for low-power EPS<\/td><\/tr>
    Active-Mode Efficiency<\/strong><\/td>Minimum efficiency curves based on output power<\/td>Stricter curves, requiring higher efficiency across all loads<\/td><\/tr>
    Scope<\/strong><\/td>Covers AC-DC and AC-AC EPS, \u2264 250 W output<\/td>Expected to cover similar power range, including battery-charging EPS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n